JPH06171339A - Air-conditioner for vehicle - Google Patents

Abstract

PURPOSE:To dissolve an expedience of continuing warm-up, the cause of which has been heretofore unknown, in a vehicular air-conditioner with automatic air-conditioning function and warm-up function. CONSTITUTION:An air conditioner for a vehicle is provided with a water valve 26 for stopping the supply of cooling water to a heater core 22 when an air mixing damper 24 closes the heater core 22 at the maximum cooling time or the like, and the heater core 22 is provided with a heating side temperature sensor 33 for detecting the temperature of air and cooling water passing the heater core 22. This air-conditioner is provided with warm-up function for stopping the operation of an air blower 4 when the temperature of the cooling water is low, and automatic air-conditioning function for controlling the opening of the air mixing damper 24 even at the warm-up time. At the warm-up time, the air mixing damper 24 is opened, and the water valve 26 is opened. Then the temperature rise of the cooling water can be detected positively by the heating side temperature sensor 33 so as to dissolve the ill condition of continuing warm-up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle having an automatic air conditioner function for automatically adjusting the temperature inside the vehicle compartment and a warm-up function for stopping the operation of the blower when the temperature of the cooling water of the engine is low. Air conditioner

[0002]

2. Description of the Related Art An automatic air conditioner function is based on the temperature of air passing through an evaporator (an example of cooling means) and bypassing the heater core and the temperature of air passing through the heater core.
By controlling the opening of the air mix damper to adjust the ratio of the amount of air that bypasses the heater core and the amount of air that has passed through the heater core, the target temperature of air blown from the duct is controlled to automatically control the temperature inside the vehicle. To adjust. When the temperature of the cooling water is low, for example, when the heating operation is started, the warm-up function causes unheated air to be blown into the passenger compartment from the duct. When the temperature is below a predetermined temperature, at least the operation of the blower is stopped.

[0003]

[Problems to be Solved by the Invention]
When the temperature of the cooling water is low, the warm-up function operates, but even if the temperature of the cooling water rises, the warm-up function is maintained and the blower does not start operating in some cases. However, the cause was unknown. Then, after pursuing various causes, it was clarified that warm-up is maintained by overlapping various functions. What are the various functions? First, the air mix damper of the air conditioner
For example, it acts to close the heater core when maximum cooling is required. At this time, even if only the heater core is closed by the air mix damper, if engine cooling water is supplied to the heater core, the heat radiated from the engine heats the air passing through the duct. In order to eliminate this inconvenience, when the air mix damper closes the heater core, the water passage for supplying the cooling water to the heater core is provided with a water valve. Further, in the automatic air conditioner function, it is necessary to accurately measure the temperature of the air that has passed through the evaporator and the temperature of the air that has passed through the heater core in order to perform accurate temperature adjustment. Therefore,
A post-evaporation sensor (cooling side temperature sensor) for measuring the temperature of air passing through the evaporator is provided on the air downstream side of the evaporator, and a heating side temperature sensor for measuring the temperature of air passing through the heater core is provided on the heater core. Is provided. The temperature detected by the heating-side temperature sensor is also the temperature of the cooling water, and by measuring the temperature of the cooling water with this heating-side temperature sensor, the control device of the vehicular air conditioner controls the cooling water in addition to the cooling water. Since it is not necessary to connect to the sensor for detecting, the temperature of the cooling water is also detected by the temperature sensor on the heating side. Furthermore, in the automatic air conditioner function, even when the warm-up function is activated, for example, the user selects outside air introduction so that the outside air is blown into the vehicle interior by the ram pressure so that the blown air approaches the target outlet temperature as much as possible. ,
The opening of the air mix damper is controlled.

In the vehicle air conditioner having the above-mentioned structure, when the temperature of the cooling water of the engine is low and the warm-up function is activated, the temperature downstream of the evaporator is lower than the target outlet temperature when the inside air is introduced. If it is high or almost the same, the auto air conditioner function closes the heater core by the air mix damper so as not to further heat the air in the heater core as much as possible. Then, the water valve is also closed in conjunction with the air mix damper, and if this state (the temperature downstream of the evaporator is higher than or almost the same as the target outlet temperature) is maintained, the water valve is closed. Staying
The engine cooling water does not flow to the heater core, and the temperature of the heater core does not rise. In this way, if the temperature of the heater core does not rise, the control device determines that the temperature of the cooling water is low, and as a result, the warm-up function is maintained.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicular air conditioner capable of reliably stopping the warm-up function when the temperature of cooling water rises. Is provided.

[0006]

The vehicle air conditioner of the present invention employs the following technical means. An air conditioner for a vehicle includes a duct for sending air toward a passenger compartment, a blower for generating an air flow toward the passenger compartment in the duct, and a cooling unit arranged in the duct for cooling passing air. A heater core that is arranged in the duct and that heats air passing therethrough by using engine cooling water as a heat source; and an air mix damper that determines the ratio of the amount of air passing through the heater core and the amount of air bypassing the heater core. A water valve provided on the cooling water upstream side of the heater core, interlocking with the air mix damper, and stopping the flow of the cooling water supplied to the heater core when the air mix damper closes the heater core,
A cooling side temperature sensor for detecting the temperature of the air passing through the cooling means, a heating side temperature sensor for detecting the temperature of the heater core, and a temperature detected by the cooling side temperature sensor,
And based on the temperature detected by the heating side temperature sensor,
In order to obtain the target blowout temperature to be blown out from the duct, the automixer has an automatic air conditioner function that automatically controls the opening degree of the air mix damper, and the temperature of the cooling water detected by the heating side temperature sensor is equal to or lower than a predetermined temperature. And a control device having a warm-up function for stopping the operation of the blower at least. The control device controls the opening degree of opening the heater core by the air mix damper even when the air mix damper closes the heater core at least when the warm-up function is activated. It has an auxiliary function.

[0007]

When the engine cooling water temperature is lower than the predetermined temperature, such as when the vehicle is started, the warm-up function of the control device is activated and the blower is deactivated. When the warm-up function is activated and at least the temperature detected by the cooling side temperature sensor is higher than the target outlet temperature, for example, when the automatic air conditioner function of the control device becomes the condition to close the heater core by the air mix damper, The air mix damper opens the heater core by the operation of the opening control auxiliary function of the control device. When the air mix damper opens the heater core, the water valve is opened and the cooling water is supplied to the heater core. By supplying the cooling water to the heater core, the heating side temperature sensor can accurately detect the temperature change of the cooling water. That is,
When the engine warms up and the cooling water warms up, the heating side temperature sensor can accurately detect that the cooling water warms up. Then, when the temperature of the heater core detected by the heating-side temperature sensor rises above a predetermined temperature, the warm-up function is stopped and the temperature inside the vehicle compartment is automatically adjusted by the auto air conditioner function.

[0008]

As has been described above, the vehicle air conditioner of the present invention, when the warm-up function is activated,
Even if the auto air conditioner functions as a condition for closing the heater core by the air mix damper, the cooling water is supplied to the heater core, so that the temperature of the cooling water can be accurately detected by the heating side temperature sensor. Therefore, it is possible to eliminate the problem that the warm-up function is continued even if the temperature of the cooling water rises as in the conventional case.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in the drawings. [Configuration of Embodiment] FIGS. 1 to 9 show an embodiment of the present invention. FIG. 1 is a schematic view of a vehicle air conditioner, and FIG. 2 is a block diagram of a control device. Vehicle air conditioner 1
Is a duct 2 that forms an air passage for sending air toward the passenger compartment.
Equipped with. The duct 2 is arranged in the vehicle compartment, and one end of the duct 2 is connected to a blower 4 having an inside / outside air switching unit 3. The inside / outside air switching unit 3 includes an inside air introduction port 5 that communicates with the inside of the vehicle to introduce the inside air, and an outside air introduction port 6 that communicates with the outside of the vehicle to introduce the outside air. The inside / outside air switching means 3 includes an inside / outside air switching damper 7, and the inside / outside air switching damper 7 can switch the air introduced into the duct 2 between the inside air and the outside air. The actuator 8 that drives the inside / outside air switching damper 7 is energized and controlled by a controller 9 described later. The blower 4 includes a fan case 10, a fan 11, and a motor 12, and the motor 1
Reference numeral 2 drives the fan 11 to rotate according to the applied voltage, and sends the inside air or the outside air into the vehicle compartment through the duct 2. The motor 12 is energized and controlled by the control device 9 described later via the motor drive circuit 13.

At the other end of the duct 2, there is formed a blowout port for blowing out the air passing through the duct 2 toward each part in the vehicle compartment. These outlets are a face outlet 14 that mainly blows cold air toward the occupant's head and chest, a foot outlet 15 that mainly blows warm air toward the occupant's feet, and mainly warm air toward the window glass. And a defroster outlet 16 for blowing out the air. In the duct 2, a face damper 17, a foot damper 18, and a defroster damper 19 that adjust the air flow rate to each air outlet are provided in the air passage leading to each air outlet. The actuator 20 that drives the face damper 17, the foot damper 18, and the defroster damper 19 is energized and controlled by the controller 9 described later.

A cooling means 21 is provided upstream of the duct 2. This cooling means 21 is a duct 2
It is an evaporator of a refrigeration cycle that cools the air passing through it. A heater core 22 is provided downstream of the cooling means 21. The heater core 22 heats the air that has passed through the cooling means 21 by using engine cooling water (warm water). In addition, in the duct 2,
A bypass path 23 that bypasses the heater core 22 is provided,
The ratio of the amount of air passing through the heater core 22 to the amount of air passing through the bypass passage 23 is adjusted by the air mix damper 24. The actuator 25 that drives the air mix damper 24 is energized and controlled by the controller 9 described later.

A water valve 26 for opening and closing the cooling water passage is provided upstream of the heater core 22 in the cooling water passage for supplying the cooling water to the heater core 22. The water valve 26 is interlocked with the air mix damper 24 by a link mechanism 27. When the air mix damper 24 closes the heater core 22, the water valve 26 is closed.
The supply of cooling water to the heater core 22 is stopped. The opening degree SW at which the air mix damper 24 opens the heater core 22.
As shown in FIG. 3, a hysteresis is provided in the relationship between the temperature and the opening of the water valve 26, and the air mix damper 24 completely closes the heater core 22 (when the opening SW is 0).
%) And the water valve 26 is closed, and when the opening degree SW at which the air mix damper 24 opens the heater core 22 becomes 5% or more, the water valve 26 is opened.
The cooling water is circulated in the cooling water passage by a pump directly connected to the engine.

A motor drive circuit 1 for supplying electric power to an actuator 8 for switching between inside and outside air and a motor 12 of a blower 4.
3, the operation of the electric functional components of the vehicle air conditioner 1, such as the actuator 20 for mode switching and the actuator 25 for driving the air mix damper 24, is controlled by the control device 9 shown in FIG. The control device 9 uses a computer and controls various actuators by various input signals and inputted programs to control the air conditioning state. As an input signal, a temperature setting device operated by the user. A control panel (not shown) including 28, an inside air sensor 29 that detects the temperature Tr of the passenger compartment air, an outside air sensor 30 that detects the outside air temperature Tam, a solar radiation sensor 31 that detects the amount of solar radiation Ts, and air that has passed through the cooling means 21. The temperature of the cooling side temperature sensor 32 that detects the temperature TE, the temperature of the air that has passed through the heater core 22, and the signals of the heating side temperature sensor 33 that detects the temperature TW of the cooling water supplied to the heater core 22 are input. . The heating side temperature sensor 33 is the heater core 2
It is directly attached to the main body of 2.

When the user selects the auto air conditioner switch, the control device 9 sets the blowout temperature, the air flow rate, and the blowout mode so that the temperature inside the passenger compartment is maintained at the temperature set by the temperature setter 28. An automatic air conditioner function 34 for automatically controlling is installed. Further, the control device 9 is provided with a warm-up function 35 that stops the operation of the blower 4 when the temperature of the cooling water detected by the cooling side temperature sensor 32 is equal to or lower than a predetermined temperature. Further, the controller 9 is provided with a warm-up auxiliary function 36 that automatically switches the blowout mode to the defroster mode when the temperature of the cooling water detected by the cooling side temperature sensor 32 is low. Further, the control device 9 further includes an opening control auxiliary function 37 that allows the air mix damper to open the heater core at an opening of 10% when the warm-up function 35 is activated.

The operation of the controller 9 will be described with reference to the flow chart shown in FIG. First, when the automatic air conditioner is selected (start), in step S1, the inside air sensor 29, the outside air sensor 30, the solar radiation sensor 31, the temperature setter 2 are set.
Read the signal from 8. Then step S2
Then, the target outlet temperature TAO is calculated by the following equation.

[Equation 1] TAO = Kset-Tset-Kr-Tr-Kam-
Tam−Ks · Ts + C where Kset is the temperature setting gain and Tset is the temperature setting device 2.
8, set temperature signal of Kr, inside temperature gain of Kr, temperature signal of inside air sensor 29, Kam outside temperature gain of Tam, temperature signal of outside air sensor 30, Ks solar radiation gain, solar radiation signal of solar radiation sensor 31 Ts, C is a correction constant.

Then, in step S4, the target blowout temperature T
In order to realize AO, the target opening degree SW of the air mix damper 24 is calculated by the following mathematical formula 2.

## EQU00002 ## SW = {(TAO-TE) / (TW-TE)} * 100 where TE is the temperature signal of the cooling side temperature sensor 32 and TW is the temperature signal of the heating side temperature sensor 33. Next, in step S4, the blowout mode is determined. The blowout mode is usually set according to the target blowout temperature TAO as shown in FIG. 5, but when the temperature of the cooling water is low, the defroster mode is preferentially selected as shown in FIG. (Warm-up auxiliary function 36). Next, in step S5, the applied voltage of the blower 4 is determined. In this step S5, the applied voltage of the blower 4 is controlled in order to automatically adjust the temperature of the passenger compartment during the operation of the automatic air conditioner, and the warm-up function 35 and the opening control auxiliary function 37 are also controlled. The control of S5 will be described later.

Next, in step S6, a control signal is output to the motor drive circuit 13 so that the applied voltage determined above is applied to the blower 4. In step S7, the target opening SW determined above is set. As obtained, a control signal is output to the actuator 25 that drives the air mix damper 24. In the following step S8, a control signal is output to the mode switching actuator 20 so that the blowout mode determined above is obtained, and then the process returns.

Next, the determination control of the applied voltage of the blower 4 in step S5 will be described with reference to the flowchart of FIG. First, in step S51, it is determined whether the blowing mode is the bi-level mode or the foot mode. That is, it is determined whether or not the foot outlet 15 is opened. When the result of this determination is NO, in step S52, as shown in FIG.
The voltage applied to the blower 4 is determined according to O, and then the process proceeds to step S6. If the decision result in the step S51 is YES, a step S53 decides whether or not the applied voltage to the blower 4 is zero. That is, it is determined whether the warm-up function 35 is operating. If the result of this determination is NO, then in step S54, first, as shown in FIG.
The applied voltage of the blower 4 is calculated from the target outlet temperature TAO. Next, as shown in FIG. 9, the applied voltage of the blower 4 according to the temperature of the cooling water is calculated. Then, of the two calculation results, the lower applied voltage value is determined as the voltage to be applied to the blower 4, and then the process proceeds to step S6.

Further, in the control of step S54, as shown in FIG.
As shown in, when the temperature of the cooling water is below a predetermined temperature,
The applied voltage of the blower 4 is set to 0 so that the operation of the blower 4 is stopped (warm-up function 35). this,
As shown in FIG. 9, the relationship between the warm-up function 35 and the temperature of the cooling water is such that hysteresis is provided and the water temperature is 40%.
When the temperature rises above ℃, the blower 4 operates and the water temperature is 37 ℃.
When it drops below, the operation of the blower 4 stops. On the other hand, if the decision result in the step S53 is YES, the warm-up function 35 is operating, and therefore, in the step S55,
The target opening SW for opening the heater core 22 by the air mix damper 24 is set to 10% (opening control auxiliary function 37), and then the process proceeds to step S54.

[Operation of the Embodiment] When the temperature of the cooling water is lower than 40 ° C. at the time of starting the vehicle, the warm-up function 35 of the control device 9 is activated and the operation of the blower 4 is stopped. If the target outlet temperature TAO is 25 ° C. and the temperature detected by the cooling side temperature sensor 32 is 25 ° C. or higher while the warm-up function 35 is operating, as shown in [Equation 2],
The target opening degree SW of the air mix damper 24 becomes 0%.
However, in the present embodiment, when the warm-up function 35 is activated, the target opening S of the air mix damper 24 is reduced.
W is set to 10%. In this way, the air mix damper 2
When the target opening SW of 4 becomes 10%, the water valve 2
The opening degree of 6 is opened to 100%, and the cooling water is supplied to the heater core 22. Then, when the temperature of the cooling water rises due to traveling of the vehicle or the like, the water valve 26 is opened, so the cooling water whose temperature has risen is surely heated.
Is supplied to. Thereby, the temperature of the cooling water can be accurately detected by the heating side temperature sensor 33. When the temperature of the cooling water detected by the heating side temperature sensor 33 rises above a predetermined temperature, the warm-up function 35
Is stopped, and the temperature inside the vehicle compartment is automatically adjusted by the automatic air conditioning function 34.

[Effects of Embodiment] In the vehicle air conditioner of this embodiment, when the warm-up function 35 is activated, the air mix damper 24 in the automatic air conditioner function 34 is used.
Even if the conditions for closing the heater core 22 are met, the opening degree control auxiliary function 37 opens the air mix damper 24 and supplies the cooling water to the heater core 22 reliably, so that the temperature of the cooling water is accurately supplied to the heating side temperature sensor 33. Can be detected by. Therefore, it is possible to reliably eliminate the problem that the warm-up function 35 continues even if the temperature of the cooling water rises as in the conventional case. Further, the present invention is implemented only by programming the control device 9 so that the air mix damper 24 is opened when the warm-up function 35 is activated. Therefore, there is an effect that the present invention can be implemented easily at low cost.

[Modification] In the above embodiment, the air mix damper is always opened when the warm-up function is activated. However, when the warm-up function is activated and the auto air conditioner function is used. The air mix damper may be opened when the condition for closing the heater core is reached by the air mix damper. In addition, in the present embodiment, an example in which the opening degree of the air mix damper is directly changed is shown, but the arithmetic expression is modified, for example, by setting the detection temperature of the cooling side temperature sensor to a low value during the warm-up function. In addition to the heating side temperature sensor, a sensor that detects the cooling water temperature is installed, or cool air is actually sent downstream of the cooling means (for example, introduction of outside air, refrigeration cycle ON), and the air mix damper is indirectly used. You can let it open. Although an example in which the air mix damper and the water valve are linked by a link mechanism has been shown, even when the air mix damper and the water valve are driven by independent actuators, respectively,
Since the opening degree of the water valve is set by the opening degree of the air mix damper, the air mix damper and the water valve may be driven by independent actuators. In addition, even if the heating side temperature sensor 33 is installed separately from the heater core 22, the heater core 22
The temperature of the heater core 22 can be detected almost accurately if the heater core 22 is attached to the direct air downstream side portion.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a vehicle air conditioner.

FIG. 2 is a block diagram of a control device.

FIG. 3 is a graph showing the relationship between the opening of the air mix damper and the opening of the water valve.

FIG. 4 is a flowchart showing the operation of the control device.

FIG. 5 is a graph showing a relationship between a target outlet temperature and an outlet mode.

FIG. 6 is a graph showing the relationship between the temperature of cooling water and the blowing mode.

FIG. 7 is a flowchart for determining an applied voltage of a blower.

FIG. 8 is a graph showing a relationship between a target outlet temperature and an applied voltage of a blower.

FIG. 9 is a graph showing the relationship between the temperature of cooling water and the voltage applied to the blower.

[Explanation of symbols]

 1 Air Conditioner for Vehicle 2 Duct 4 Blower 9 Controller 21 Cooling Unit 22 Heater Core 24 Air Mix Damper 26 Water Valve 32 Cooling Side Temperature Sensor 33 Heating Side Temperature Sensor 34 Auto Air Conditioner Function 35 Warm Up Function 37 Opening Control Auxiliary Function

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yuji Honda, 1-1, Showa-cho, Kariya city, Aichi Prefecture, Nihon Denso Co., Ltd. (72) Inventor, Yuji Ito, 1-1, Showa-cho, Kariya city, Aichi prefecture Within the corporation

Claims (1)

[Claims] 1. (a) A duct for sending air into a passenger compartment, (b) a blower for generating an air flow toward the passenger compartment in the duct, (c) disposed in the duct and passing therethrough. Cooling means for cooling the air to be used, (d) a heater core which is arranged in the duct and heats the air passing therethrough by using engine cooling water as a heat source, and (e) an amount of air passing through the heater core and a bypass of the heater core. An air mix damper that determines the ratio of the amount of air to be generated, and (f) is provided on the cooling water upstream side of the heater core,
A water valve that interlocks with the air mix damper to stop the flow of cooling water supplied to the heater core when the air mix damper closes the heater core; and (g) the temperature of the air that has passed through the cooling means. (H) a heating side temperature sensor for detecting the temperature of the heater core, (i) (i-1) a temperature detected by the cooling side temperature sensor, and the heating side temperature sensor In order to obtain a target blowout temperature to be blown out from the duct based on the temperature detected in, the automixer has an automatic air conditioner function for automatically controlling the opening degree of the air mix damper, and (i-2) the heating side. A controller having a warm-up function for stopping the operation of the blower at least when the temperature of the cooling water detected by the temperature sensor is equal to or lower than a predetermined temperature; In a vehicle air conditioner comprising, the control device uses the air mix damper when the warm-up function is activated and at least when the air-mix damper closes the heater core by the auto air conditioner function. An air conditioner for a vehicle, comprising an opening control auxiliary function for opening the heater core.